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SMTP Error Code 551

The transaction failed permanently. The server will not try to send the message again.

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ImprovMXAll ImprovMX codes →

smtp;551 5.7.1 Due to the very low reputation of the sending domain, this message has been blocked (Code 2).

smtp;551 5.7.1 Loop detected: Email is sent and forwarded from/to improvmx.com. (#id-5.9.0)

smtp;551 5.7.1 Domain not found (#id-5.9.2)

smtp;551 5.7.1 Our database returned invalid pieces of information about the requested recipient’s domain (#id-5.9.3)

smtp;551 5.7.1 Unable to correctly read the forwarding recipient (where to forward the email to) (#id-5.9.5)

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smtp;551 5.3.0 Unknown error

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